Efficiency of multi-beam Fourier phase gratings at 1.4 THz

Efficiency of multi-beam Fourier phase gratings at 1.4 THz

Mirzaei, B. (TU Delft QN/Gao Lab; Kavli institute of nanoscience Delft)
Silva, J. R.G. (SRON Netherlands Institute for Space Research)
Luo, Y. (Student TU Delft; Kavli institute of nanoscience Delft)
Liu, X. X.
Wei, L. (TU Delft ImPhys/Optics)
Hayton, Darren J. (SRON Netherlands Institute for Space Research)
Gao, J.R. (TU Delft QN/Gao Lab; SRON Netherlands Institute for Space Research; Kavli institute of nanoscience Delft)
Groppi, C (Arizona State University)

2017-03-20

We compare the results of simulated and measured power efficiency and far-field beam pattern, for two reflective Fourier phase gratings, designed to generate 2 x 2 and 2 x 4 beams respectively from a single-beam, coherent source at 1.4 THz. The designed surface structures were manufactured on aluminum plates by a computer numerical control (CNC) micro-milling machine. Despite small differences between the designed and fabricated gratings, we measured power efficiencies of both gratings to be around 70%, which is in a good agreement with the simulated values. We also find a good agreement between the simulated and measured diffracted beam size and spatial distribution. We demonstrate the application of both gratings as multiple beam local oscillators to simultaneously pump (or operate) a 4-pixel array of superconducting heterodyne mixers.

http://resolver.tudelft.nl/uuid:f3cfcb86-0fc6-4abd-a700-7ec774e9f4c2

https://doi.org/10.1364/OE.25.006581

1094-4087

Optics Express, 25 (6), 6581-6588

Institutional Repository

journal article

© 2017 B. Mirzaei, J. R.G. Silva, Y. Luo, X. X. Liu, L. Wei, Darren J. Hayton, J.R. Gao, C Groppi